Mystery Ukulele

Attention ukulele detectives. Among several dozen vintage ukuleles that are on consignment at Lamorinda Music is this mysterious baby.

The label reads:

Anton Abreo
Maker Of String Instruments
Especially Guitars
Paia, Maui

Here's what I can tell you about the instrument. It appears legitimately old (someone clearly has played the heck out of this for years and it arrived with the vestiges of old gut strings imbedded in the bridge) and really heavy compared with early ukuleles. The soundhole rings may be ivory, and the grooves are cut so deeply that the wood has separated behind them.

It has a metal saddle. The geared tuners appear to be later additions.

Any help identifying it is appreciated. A set of images are at the link. Link